JPH04292824A - Seal structure of operation shaft of gas switch - Google Patents

Abstract

PURPOSE:To lessen the number of penetrating parts and seal parts and at the same time to improve the reliability of the seal and provide a compact gas switch. CONSTITUTION:A rotating operation shaft 3A to operate opening and closing a gas switch by rotation is supported in an open part 2 of a box 1 through a bearing 4. The rotating operation shaft 3A is composed of a rotating operation outer shaft 30 and a rotating operation inner shaft 31 set concentrically in double structure and respective operation is made possible. Further, an O-ring 12A, which is a seal, is interposed between the bearing 4 and the rotating operational outer shaft 30 and an O-ring 12B, which is a seal, is interposed between the rotating operation outer shaft 30 and the rotating operation inner shaft 31. The penetrating parts of the rotating operation shaft are concentrated at one position and thus seal parts are lessened and the seal parts can be used in common.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for a rotary operating shaft of a gas switch.

0002

[Prior Art] As shown in FIG. 2, the conventional operation shaft seal structure of a gas switch has an SF
6 Filled with insulating gas consisting of gas,
A gas switch (not shown) is disposed, and the housing 1 is provided with a plurality of openings 2, through which the gas switch is opened and closed by rotating in the direction of the arrow. The rotation operation shafts 3 are respectively supported via bearings 4.

A frame 5 is disposed inside the housing 1 on the side opposite to the opening 2, and the frame 5 includes the opening 2 and the opening 2.
A plurality of holes are bored opposite to the bearing 2, and a bearing 6 is fitted into the plurality of holes.

On the other hand, the rotation operation shaft 3 is located inside the housing 1 through a bearing 4, and its narrowed end is rotatably supported by a bearing 6. Further, a pair of operating levers 7 are fixed to the rotating operating shaft 3 in the housing 1, and a rod pin 8 is mounted between the pair of operating levers 7. is connected to the operating rod 9.

On the other hand, the bearing 4 is screwed into the opening 2 through a plurality of bolts 10, and a circular groove 11 is bored in the overlapping surface that overlaps with the housing 1. is an O-ring 12 that serves as a seal to prevent leakage of insulating gas.
is inserted. Furthermore, a plurality of circular grooves 11A are bored in the inner circumferential surface of the bearing 4 that comes into contact with the rotation operation shaft 3. are inserted respectively.

[0006] Therefore, when the rotary operating shaft 3 is rotated in the direction of the arrow by a manual operation or an operating mechanism (not shown), the operating lever 7 fixed thereto rotates to open and close the gas switch.

[0007]

[Problems to be Solved by the Invention] The conventional operating shaft seal structure of a gas switch is constructed as described above, and O-rings 12 and 12A, which are sealing devices, are provided in accordance with the number of rotary operating shafts 3. Therefore, when there are multiple rotation operation shafts 3, O-rings 12 and 12A must be provided for the number of rotation operation shafts 3, which requires a large amount of installation space and makes it difficult to manufacture a compact gas switch. There was a problem above.

The present invention has been made in view of the above, and provides an operating shaft seal for a gas switch that reduces the number of sealing parts, improves seal reliability, and provides a compact gas switch at a low cost. The purpose is to provide structure.

[0009]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides an insulating gas filled inside a casing, a switch disposed inside the casing, and a switch inside the casing. It is equipped with a rotation operation shaft that is rotatably supported by a bearing that closes the opening and rotates to open and close the switch, and a seal that is interposed between the rotation operation shaft and the bearing. Moreover, the rotary operation shaft has a concentric double structure consisting of a cylindrical outer shaft rotatably supported by a bearing and an inner shaft rotatably passing through the outer shaft. , is characterized in that a seal is interposed between the outer shaft and the inner shaft.

0010

[Function] According to the present invention, the rotary operation shaft has a concentric double structure consisting of the outer cylinder and the inner shaft, so the rotation operation shaft can pass through only one place, and the seal can be sealed. The number of locations can be reduced and the sealing device can be used commonly.

[0011]

[Embodiment] Hereinafter, the present invention will be described in detail based on an embodiment shown in FIG.
The housing 1 is filled with an insulating gas, and a gas switch (not shown) is arranged. Rotating operation shaft 3A that rotates in the direction to open and close the gas switch
is pivotally supported via a bearing 4.

A frame 5 is disposed inside the housing 1 on the side opposite to the opening 2, and a hole facing the opening 2 is bored in the frame 5. A bearing 6 is fitted.

On the other hand, the rotation operation shaft 3A has a cylindrical rotation operation outer shaft 30 that is rotatably supported by a bearing 4, and passes through this rotation operation outer shaft 30, with a narrowed end. It has a concentric double structure with a rotatable rotary operation inner shaft 31 supported by a bearing 6. The rotation operation outer shaft 30 has inside both ends,
A bearing 13 that supports the rotation operation inner shaft 31 is fitted, and a plurality of circular grooves 11B are provided on the inner peripheral surface on the frame 5 side. An O-ring 12B serving as a seal to prevent leakage is inserted in each. In addition, the rotary operation outer shaft 30 inside the housing 1 includes:
A pair of operating levers 7 are fixed, and a rod pin 8 is mounted between the pair of operating levers 7.
An operating rod 9 is connected to. Further, a pair of operating levers 7A are fixed to the rotating operating shaft 31 passing through the rotating operating outer shaft 30, and a rod pin 8A is mounted between the pair of operating levers 7. For rod pin 8A,
An operating rod 9A is connected thereto.

On the other hand, the bearing 4 is screwed into the opening 2 via a plurality of bolts 10, and a circular groove 11 is bored in the overlapping surface that overlaps with the housing 1. is an O-ring 12 that serves as a seal to prevent leakage of insulating gas.
has been inserted. Furthermore, a plurality of circular grooves 11A are bored in the inner circumferential surface of the bearing 4 that is in contact with the rotation operation outer shaft 30, and an O-ring having the same function as the O-ring 12 is provided in the plurality of grooves 11A. 12A are inserted respectively.

Therefore, when the rotary operation outer shaft 30 is rotated in the direction of the arrow by a manual operation or an operation mechanism (not shown), the operation lever 7 fixed thereto rotates to open and close the gas switch. Further, when the rotary operation inner shaft 31 is rotated in the direction of the arrow by a human operation or an operation mechanism not shown, the operation lever 7A fixed thereto rotates to open and close the gas switch.

According to the above structure, the rotation operation shaft 3A has a concentric double structure consisting of the rotation operation outer shaft 30 and the rotation operation inner shaft 31, so that the rotation operation shaft 3A has a concentric double structure. As is clear from the comparison, the number of through parts can be reduced, and this reduction can lead to a reduction in the number of sealing parts and parts. Moreover, it becomes possible to manufacture the device at low cost. Furthermore, a compact switch with improved seal reliability can be obtained.

In the above embodiment, the O-ring 1 is attached to the bearing 4.
2A is shown in which an O-ring 12B is arranged on the rotational operation outer shaft 30, respectively. It may be arranged. Further, although the above embodiment has been described using a seal consisting of O-rings 12, 12A, and 12B, a magnetic seal or the like may also be used. Further, in the above embodiment, the case of a switch has been described, but the same effects as in the above embodiment can be obtained for a liquid pair such as oil.

[0018]

As described above, according to the present invention, the rotation operation shaft has a concentric double structure consisting of the rotation operation outer shaft and the rotation operation inner shaft. This reduction has the effect of reducing the number of sealing locations and parts. Further, there is an effect that the device can be manufactured at low cost. Furthermore, it is possible to obtain a compact switch with improved seal reliability.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an operating shaft seal structure for a gas switch according to the present invention.

FIG. 2 is a cross-sectional view showing an operating shaft seal structure of a conventional gas switch.

[Explanation of symbols]

1 Housing 2 Opening 3 Rotation operation axis 3A　　　　Rotation operation axis 4 Bearing 6 Bearing 7 Operation lever 7A Operation lever 11 Groove 11A Groove 11B Groove 12 O-ring (seal) 12A O-ring (seal) 12B O-ring (seal) 13 Bearing 30 Rotation operation outer shaft (outer shaft) 31 Rotation operation inner shaft (inner shaft)

Claims (1)

[Claims] Claim 1: An insulating gas filled inside a casing, a switch disposed inside the casing, and a rotating shaft rotatably supported by a bearing that closes an opening of the casing. In an operation shaft seal structure for a gas switch, the rotary operation shaft is provided with a rotary operation shaft for opening and closing the switch, and a seal interposed between the rotary operation shaft and the bearing. It has a concentric double structure consisting of a cylindrical outer shaft that is rotatably supported by the shaft, and an inner shaft that rotatably passes through the outer shaft.
An operating shaft seal structure for a gas switch, characterized in that a seal is interposed between the outer shaft and the inner shaft.